d310635b65
Wire real spell-checking into the editor via hunspell-wasm (bundled en_US dictionary) and an optional LanguageTool grammar client. - spell/: HunspellSpellEngine wrapper, pure spell logic, base64 en_US dict - grammar/: LanguageToolEngine grammar client and pure grammar logic - decorations/: collectBlock text assembly, offset-mapped CheckService, buildCheckDecorations (flat DecorationSet, inline spell/grammar marks) - export engines and types from editor index; add hunspell-wasm dep Verified: typecheck (6 pkgs), tests (all pass), lint (6 pkgs), and web build all green.